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ntb: epf: Remove redundant pci_clear_master 

Remove pci_clear_master to simplify the code,
the bus-mastering is also cleared in do_pci_disable_device,
like this:
./drivers/pci/pci.c:2197
static void do_pci_disable_device(struct pci_dev *dev)
{
	u16 pci_command;

	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
	if (pci_command & PCI_COMMAND_MASTER) {
		pci_command &= ~PCI_COMMAND_MASTER;
		pci_write_config_word(dev, PCI_COMMAND, pci_command);
	}

	pcibios_disable_device(dev);
}.
And dev->is_busmaster is set to 0 in pci_disable_device.

Signed-off-by: Cai Huoqing <cai.huoqing@linux.dev>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Cai Huoqing 2023-03-24 09:32:19 +08:00 committed by Jon Mason
parent da6b4dc49e
commit f2748c6d76
1 changed files with 4 additions and 8 deletions
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12
drivers/ntb/hw/epf/ntb_hw_epf.c
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@ -591,7 +591,7 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "Cannot set DMA mask\n");
goto err_dma_mask;
goto err_pci_regions;
}
dev_warn(&pdev->dev, "Cannot DMA highmem\n");
}
@ -599,14 +599,14 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
ndev->ctrl_reg = pci_iomap(pdev, ndev->ctrl_reg_bar, 0);
if (!ndev->ctrl_reg) {
ret = -EIO;
goto err_dma_mask;
goto err_pci_regions;
}
if (ndev->peer_spad_reg_bar) {
ndev->peer_spad_reg = pci_iomap(pdev, ndev->peer_spad_reg_bar, 0);
if (!ndev->peer_spad_reg) {
ret = -EIO;
goto err_dma_mask;
goto err_pci_regions;
}
} else {
spad_sz = 4 * readl(ndev->ctrl_reg + NTB_EPF_SPAD_COUNT);
@ -617,14 +617,11 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
ndev->db_reg = pci_iomap(pdev, ndev->db_reg_bar, 0);
if (!ndev->db_reg) {
ret = -EIO;
goto err_dma_mask;
goto err_pci_regions;
}
return 0;
err_dma_mask:
pci_clear_master(pdev);
err_pci_regions:
pci_disable_device(pdev);
@ -642,7 +639,6 @@ static void ntb_epf_deinit_pci(struct ntb_epf_dev *ndev)
pci_iounmap(pdev, ndev->peer_spad_reg);
pci_iounmap(pdev, ndev->db_reg);
pci_clear_master(pdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);